Maybe this technology was utilized?
Would not be surprised if the perp has started wearing glasses, imo.
Facial Recognition Could Help Identity People When They Are Disguised | Digital Trends
"Engineers at India’s National Institute of Technology and Institute of Science and the U.K.’s University of Cambridge have developed a facial recognition framework that can identify even people who actively obscure their faces.
“This system can be used to identify a person even if they are disguised,”
Amarjot Singh, from the University of Cambridge, told Digital Trends. “This can be used to identify criminals trying to disguise their appearance to avoid law enforcement. The problem of Disguise Face Identification (DFI) is an extremely challenging and interesting problem that is of great interest to law enforcement — as they can use this technology to identify criminals.”
The deep learning-based system works by identifying 14 key areas of the face, including 10 for the eyes, three for the lips, and one for the nose. It is capable of estimating these even when they are obscured in some way. It then compares these readings to images to find a match. In early tests, the results were 56 percent accurate at finding the right person when their face was covered with a hat or scarf —
although this dropped to 43 percent when they also wear glasses. Those figures are not going to be considered evidence in a court of law anytime soon, but they could certainly help police narrow down a search."